CN116736158A - Performance test device for simulating battery cells in battery module - Google Patents
Performance test device for simulating battery cells in battery module Download PDFInfo
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- CN116736158A CN116736158A CN202310528244.6A CN202310528244A CN116736158A CN 116736158 A CN116736158 A CN 116736158A CN 202310528244 A CN202310528244 A CN 202310528244A CN 116736158 A CN116736158 A CN 116736158A
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- 238000012360 testing method Methods 0.000 claims abstract description 180
- 238000003825 pressing Methods 0.000 claims description 75
- 238000007599 discharging Methods 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 20
- 239000003063 flame retardant Substances 0.000 claims description 17
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 15
- 239000000523 sample Substances 0.000 claims description 13
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- 230000017525 heat dissipation Effects 0.000 description 4
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3646—Constructional arrangements for indicating electrical conditions or variables, e.g. visual or audible indicators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Battery Mounting, Suspending (AREA)
Abstract
The application discloses a performance testing device for simulating an electric core in a battery module, which comprises: the device comprises a box body, a power assembly, a driving assembly, a pressure assembly and a performance testing assembly. The performance testing device for simulating the battery cells in the battery module can simulate the environment of the battery module in a real state and test the performance of the battery cells in the environment. The device simple structure, easy operation, and the accuracy of test electric core's temperature, pressure and voltage is high.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a performance testing device for simulating an electric core in a battery module.
Background
After the lithium ion battery pack is produced, the comprehensive performance of the battery cells of the battery pack in use needs to be tested, including the test of electrical performance or safety performance. In the testing process, the temperature, pressure and voltage of the battery cells in the battery module are mainly focused on.
At present, there are two common ways of testing the performance of the battery cell: one is to test individual cells directly. Because in the battery module, there is the interact power between the adjacent electric core to battery module shell has an holistic pretightning force to the battery module. The direct test of a single battery cell in the battery module is insufficient to simulate the actual assembly state of the battery cell in the battery module, so that the test environment deviates from the actual environment, and the accuracy of the test result is low; another is to test each cell in the battery module. Under this kind of mode, need all set up corresponding testing arrangement to every electric core, this can make every testing arrangement connect temperature, pressure and the voltage of the corresponding electric core of different collection line test to lead to testing arrangement huge, the circuit in the testing arrangement is complicated, therefore, this kind of testing arrangement can bring operation complicacy, the high problem of test degree of difficulty.
Therefore, there is an urgent need for a device for testing the performance of a battery cell with high accuracy and simple operation.
Disclosure of Invention
The application provides a performance testing device for simulating a battery cell in a battery module, which has high accuracy in testing the temperature, pressure and voltage of the battery cell and is simple to operate.
In order to solve one or more of the technical problems, the application adopts the following technical scheme:
the application provides a performance testing device for simulating an electric core in a battery module, which comprises: the device comprises a box body, a power assembly, a driving assembly, a pressure assembly and a performance testing assembly;
the pressure component is connected to the inner wall of the box body and forms a closed test cavity with the box body, the test cavity is used for placing a battery cell to be tested, and the pressure component can reciprocate on the inner wall of the box body in a direction away from or towards the battery cell to be tested under the drive of the driving component;
when the pressure component moves towards the battery cell to be tested and is positioned at a force application position for applying pressure to the battery cell to be tested, the box body, the battery cell to be tested and the pressure component form an analog battery module;
the power component is connected with the battery cell to be tested and peripheral charging and discharging equipment so as to realize charging and discharging of the battery cell to be tested;
The performance testing component is used for testing the performance parameters of the battery cell to be tested, and the performance parameters of the battery cell to be tested comprise at least one of temperature, pressure and voltage.
Further, the pressure assembly comprises a pressure plate, the box body comprises a base and a side plate, and the pressure plate, the base and the side plate are enclosed to form the test cavity; at least one of the pressing plate, the base and the side plate is of a hollow structure, and the hollow structure is filled with heat insulation materials.
Further, the pressing plate is a flat plate with a planar structure.
Further, the base is of at least two-layer structure, the at least two-layer structure comprises a supporting layer and a flame-retardant layer which are sequentially arranged along the direction far away from the testing cavity, and the material of the supporting layer comprises an insulating material.
Further, the base is at least three-layer structure, at least three-layer structure includes from keeping away from supporting layer, fire-retardant layer and the supporting layer that the direction of test cavity set gradually, the material of supporting layer includes insulating material, the base is hollow structure still, fire-retardant layer sets up in the hollow structure.
Further, the surface of base is provided with the mounting groove, the mounting groove is used for installing power component, the area of mounting groove is greater than power component's bottom area, testing arrangement still includes the caulking piece, the caulking piece sets up in the mounting groove, the caulking piece with power component butt is in order to fix in the mounting groove power component.
Further, the pressing plate comprises a pressing plate body and a protruding structure connected with the pressing plate body, a chute matched with the protruding structure is formed in the side plate which is arranged oppositely, and the protruding structure can reciprocate in the chute along a direction away from or towards the cell to be tested.
Further, the testing device further comprises an elastic component arranged between the driving component and the pressing plate, and the elastic component can deform along the reciprocating movement direction of the pressing plate under the action of the driving component or the battery cell to be tested;
preferably, one end of the elastic component is connected with the driving component, and the other end of the elastic component is connected with the pressing plate;
or alternatively, the first and second heat exchangers may be,
preferably, one end of the elastic component is connected with the driving component, the other end of the elastic component is abutted to the pressing plate when contacting with the pressing plate, the protruding structure and the sliding groove have preset friction force, the friction force is set to be kept motionless in the sliding groove when the pressing plate receives an external force smaller than a preset pressure value, and the protruding structure slides in the sliding groove when the pressing plate receives an external force not smaller than the preset pressure value.
Further, the drive assembly includes telescopic bolt, elastic component includes the elastic rod, be provided with the mounting groove on the clamp plate, the box still includes the roof, the roof sets up the clamp plate is kept away from one side of test cavity, the bolt mounting hole has been seted up on the roof, telescopic bolt passes the bolt mounting hole with the elastic rod is connected, the elastic rod is kept away from telescopic bolt's one end with the constant head tank is connected or the butt.
Further, the performance testing assembly comprises a temperature testing assembly, the temperature testing assembly comprises a heat conducting layer and a temperature probe, the heat conducting layer is arranged on the pressure assembly and is in surface contact with the battery cell to be tested when the pressure assembly is located at the force application position, the temperature probe is arranged on the heat conducting layer and is far away from one surface of the battery cell to be tested, and the temperature probe is used for obtaining the temperature of the battery cell to be tested through testing the temperature of the heat conducting layer.
Further, the heat conducting layer is arranged at the center of the pressure component, and the length of the heat conducting layer in the direction of extending the electrode lug of the battery cell to be tested is smaller than that of the battery cell to be tested.
Further, the power component is arranged on the base, the power component is connected with the battery cell to be tested and peripheral charging and discharging equipment through a power line so as to realize charging and discharging of the battery cell to be tested, the power component comprises a supporting unit and a conducting unit and a power line mounting port, the conducting unit is arranged on the supporting unit and is used for electrically connecting the peripheral charging and discharging equipment with the battery cell to be tested, a mounting hole is formed in the side plate, and the power line penetrates through the mounting hole and is connected with the power line mounting port so as to realize connection of the peripheral charging and discharging equipment with the conducting unit.
Further, the performance testing assembly further comprises a voltage testing assembly, and the voltage testing assembly is used for testing the voltage of the battery cell to be tested.
Further, the voltage testing assembly comprises a voltage acquisition line, and the voltage acquisition line tests the voltage of the to-be-tested battery cell through the power line;
or alternatively, the first and second heat exchangers may be,
and the voltage acquisition line tests the voltage of the battery cell to be tested through the conductive unit.
Further, the testing device further comprises a temperature and pressure alarm assembly, wherein the temperature and pressure alarm assembly is used for sending an alarm signal when the temperature of the battery cell to be tested exceeds a first threshold value or the pressure of the battery cell to be tested exceeds a second threshold value.
Further, the testing device further comprises a display, wherein the display is used for displaying the performance parameters of the battery cells to be tested, which are tested by the performance testing component, and providing a signal for the peripheral charging and discharging equipment to disconnect the peripheral charging and discharging equipment from the battery cells to be tested when the performance parameters of the battery cells to be tested exceed a preset threshold.
According to the specific embodiment provided by the application, the application discloses the following technical effects:
The application provides a performance testing device for simulating a battery cell in a battery module, which simulates the stress state of a battery module shell and the battery cell in the battery module by arranging a box body and a pressure assembly, so that the testing environment is more close to the state of the battery cell in the actual assembly process, and the accuracy of the performance test of the battery cell is improved. And moreover, the performance of the battery cell is tested through the simulation environment, so that the problems of complex testing device and high operation difficulty during testing in a real battery module are avoided.
Further, when the temperature of the battery cell to be tested is tested, the heat conducting layer is in surface contact with the battery cell to be tested, in the normal charge and discharge process, the temperature of the surface of the battery cell to be tested can be transmitted to the heat conducting layer, and the temperature probe obtains the temperature of the battery cell to be tested by testing the temperature of the heat conducting layer, so that the change of the temperature probe from point contact to surface contact is realized, the monitoring area of the temperature is increased, and the accuracy of the temperature test is improved.
Further, the heat-insulating material is filled in the box body and the pressing plate, the battery cells are coated between the heat-insulating layers in the battery cell testing process and are closer to the actual state of the battery cells in the actual assembly process, and the influence of heat dissipation of the environment on temperature testing is reduced.
Furthermore, the surface of the base of the testing device provided by the application is made of insulating materials, so that the risk of short circuit of the battery cell can be avoided. The heat conducting layer is arranged at the center of the pressing plate, so that the lugs at the two ends of the battery cell to be tested can be prevented from being contacted simultaneously, and the occurrence of short circuit can be effectively prevented. In the testing process, the battery cell is coated in the sealed insulating pressure-resistant flame-retardant hard box, so that a combustion channel is blocked, and even if the battery cell is out of control, certain damage to external equipment or personnel cannot be caused. In addition, the device is also provided with a temperature and pressure alarm assembly and a display, when the temperature or the pressure is greater than a certain limit, the temperature and pressure alarm assembly can send an alarm signal, and the display transmits the signal to peripheral charge and discharge equipment so as to disconnect a power supply channel and inhibit further occurrence of accidents. In the process of testing the battery cell, the safety risk can be further reduced due to multiple protection such as pressure protection, temperature protection, voltage protection of charge-discharge equipment and the like.
Furthermore, the test device provided by the application can simulate the effect of the battery cell under the actual use condition, can accurately test the data of the battery cell under the actual use condition in the design stage, and can assemble the battery module for testing without the research and development stage, thereby greatly reducing the test cost. In addition, the testing device is small and flexible, can be matched with devices such as a high-low temperature box and the like to be used, does not need to be provided with an additional temperature regulating device, can effectively ensure the accuracy of charge-discharge temperature rise of the battery cell, and further reduces the cost. Moreover, the testing device provided by the application can be repeatedly used, can be flexibly regulated and controlled, is suitable for most of the battery cells, has high adaptation degree, and does not need to redesign the fixture according to different battery cell sizes, thereby further reducing the cost.
Of course, it is not necessary for any one product to practice the application to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a performance testing device for simulating a battery cell in a battery module according to an embodiment of the present application in one direction:
fig. 2 is a schematic structural diagram of another direction of a performance testing device for simulating a battery cell in a battery module according to an embodiment of the present application;
fig. 3 is a schematic cross-sectional structure of a performance testing device for simulating a battery cell in a battery module according to an embodiment of the present application:
FIG. 4 is a schematic diagram of a pressure assembly according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a power assembly according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a temperature testing assembly according to an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.
As described in the background art, testing a single battery cell is not enough to simulate the actual assembly state of the battery cell in the battery module, so that the test environment deviates from the actual environment, and the accuracy of the test result is low. If each cell in the battery module is tested, the testing device is huge in size, high in testing difficulty and complex in operation, and mass production is not facilitated. In this regard, the application provides a performance test device for simulating the battery cells in the battery module, which can simulate the battery module environment in a real state and test the performance of the battery cells in the environment. The device simple structure, easy operation, and the accuracy of test electric core's temperature, pressure and voltage is high.
The following will be described by way of specific examples.
Example 1
Aiming at the problems, the embodiment of the application creatively provides a performance testing device for simulating an electric core in a battery module. Fig. 1 is a schematic structural diagram of a performance testing device for simulating a battery cell in a battery module according to an embodiment of the present application; fig. 2 is a schematic structural diagram of another direction of a performance testing device for simulating a battery cell in a battery module according to an embodiment of the present application; fig. 3 is a schematic cross-sectional structure of a device for testing performance of a battery cell in a simulated battery module according to an embodiment of the present application; FIG. 4 is a schematic diagram of a pressure assembly according to an embodiment of the present application; fig. 5 is a schematic structural diagram of a power assembly according to an embodiment of the present application. Referring to fig. 1, and simultaneously to fig. 2, 3, 4 and 5, the performance test device for simulating the battery cells in the battery module includes: the device comprises a box 100, a power assembly 200, a pressure assembly, a driving assembly 400 and a performance testing assembly.
In the embodiment of the application, a pressure component is arranged to be connected with the inner wall of the box body 100 and forms a closed test cavity 900 with the box body 100 for placing the battery cells 700 to be tested. The to-be-tested battery cell 700 comprises a square aluminum-shell battery cell, a steel-shell cylindrical battery cell, an aluminum-plastic film soft-package battery cell and the like. Wherein the pressure assembly can reciprocate on the inner wall of the case 100 in a direction away from or toward the cell 700 to be tested in the test chamber 900 under the driving of the driving assembly 400. When the pressure component moves towards the battery cell 700 to be tested and is located at a force application position for applying pressure to the battery cell 700 to be tested, the battery cell 700 to be tested receives the extrusion force of the pressure component and the inner wall surface of the box body 100 opposite to the pressure component, and the state that the battery cell receives the interaction force of the adjacent battery cells in the battery module can be simulated. And at this time, the inner wall of the case 100 and the pressure assembly form a battery module housing, and the battery module can be simulated by applying a pretightening force to the battery cell 700 to be tested.
The state of the battery module shell and the battery cell in the battery module is simulated through the box body 100 and the pressure assembly, so that the testing environment is more close to the state of the battery cell in the actual assembly process, and the accuracy of the battery cell performance test is improved. And moreover, the performance of the battery cell is tested through the simulation environment, so that the problems of complex testing device and high operation difficulty during testing in a real battery module are avoided.
The battery cell 700 to be tested is placed in the closed test cavity 900 formed by the box body 100 and the pressure component for testing, and safety accidents such as thermal runaway and the like of the battery cell 700 to be tested can be prevented, for example: and the safety of testers is further effectively protected by eruption of substances such as electrolyte and the like.
The pressure component in the application can move along the inner wall of the box body 100 relative to the battery cell 700 to be tested, so that different pressures can be provided for the battery cell 700 to be tested according to the needs, and the test simulation of various pressure conditions is facilitated. In addition, the pressure component can move along the inner wall of the box 100 relative to the battery cell 700 to be tested, and the moving position of the pressure component can be adjusted according to the thickness of the battery cell 700 to be tested so as to form the test cavity 900 with a corresponding height, so that the test device can adapt to the testing of battery cells with various specifications and sizes.
In a preferred embodiment of the present application, to better accommodate testing of different sized cells, the plates, e.g., side plates, that make up the housing 100 may be configured to be movable relative to the housing base to form a test cavity 900 of a greater size scale in combination with movement of the pressure assembly to accommodate testing of a greater number of different sized cells.
By way of illustration only, and not by way of limitation, the shape of the case 100 may be square, polygonal, circular, etc., and the shape of the case 100 may be adapted to the cell 700 to be tested, and may be selected according to actual needs without departing from the inventive concept, and is not specifically limited herein. In order to simulate the performance of the battery cell 700 to be tested in the actual charging and discharging process, the testing device provided by the embodiment of the application further comprises a power component 200, wherein the power component 200 is connected with the battery cell 700 to be tested and peripheral charging and discharging equipment so as to realize the charging and discharging of the battery cell 700 to be tested. Here, the peripheral charging and discharging device is a charging and discharging device for charging and discharging the battery cell 700 to be tested.
After the lithium ion battery is produced, the comprehensive performance of the battery cell group needs to be tested, and the temperature, the pressure and the voltage of the battery cell group are mainly considered in the test process. In order to meet the requirement of testing the comprehensive performance of the battery cell group, the testing device further comprises a performance testing component, wherein the performance testing component is used for testing the performance parameters of the battery cells to be tested, and the performance parameters of the battery cells to be tested comprise at least one of temperature, pressure and voltage.
The testing device provided by the application can simulate the state of the battery cell in the actual assembly process, can accurately test the data of the battery cell in the actual use state in the design stage, does not need to assemble a battery module to test in the research and development stage, and greatly reduces the testing cost.
In addition, this testing arrangement simple structure, it is small and exquisite nimble, can directly place in the high low temperature case, the high low temperature case can carry out temperature regulation and control to the testing arrangement who places in its inside, so this testing arrangement need not to be equipped with extra temperature regulation and control device to can guarantee the precision of the charge and discharge temperature rise of electric core effectively, further the cost is reduced. Moreover, the testing device provided by the application can be repeatedly used, can be flexibly regulated and controlled, is suitable for most of the battery cells, has high adaptation degree, and does not need to redesign the fixture according to different battery cell sizes, thereby further reducing the cost.
Example two
In order to better simulate the interaction force between adjacent battery cells and the integral pretightening force of the battery module shell on the battery module, in the embodiment, the pressure assembly comprises a pressing plate 300, and has more force application area with the battery cell 700 to be tested, and the pressing plate 300 is used for applying a certain pressure to the battery cell 700 to be tested, so that the force application area of the battery cell 700 to be tested is larger and the force application is more uniform.
As a preferred embodiment, the pressing plate 300 is a flat plate with a planar structure, and when the pressure is applied to the to-be-tested battery cell 700, the flat plate with the planar structure can have a larger contact area with the surface of the to-be-tested battery cell 700, so that the stress of the to-be-tested battery cell 700 is more uniform.
In a specific embodiment, the case 100 includes a base 110, side plates (130, 131, 140, 150), and the pressing plate 300, the base 110, and the side plates (130, 131, 140, 150) enclose a test cavity 900, in which the cell 700 to be tested is placed. Specifically, when the test cavity 900 is in a rectangular structure, the side plates include a first side plate 130, a second side plate 131, a third side plate 140 and a fourth side plate 150, where the first side plate 130 and the third side plate 140 are oppositely disposed, and the second side plate 131 and the fourth side plate 150 are oppositely disposed.
In order to facilitate guiding and limiting the movement of the pressure assembly in the inner wall of the case 100, the pressure assembly and the case are provided with sliding guiding structures which are matched with each other. Specifically, the pressing plate 300 includes a pressing plate body 310 and a protrusion structure 320 connected to the pressing plate body 310, a sliding groove 190 matched with the protrusion structure 320 is formed on an inner wall of a side plate of the box body 100, and the protrusion structure 320 can reciprocate in the sliding groove 190 along a direction away from or toward the to-be-tested cell 700.
In particular embodiments, the chute 190 may be formed in any one or more of the side panels of the housing 100, and preferably may be formed in the interior walls of opposing side panels of the housing 100, such as side panels 130 and 140, or second side panel 131 and fourth side panel 150 of the housing 100.
The number of the sliding grooves 190 and the number of the protrusion structures 320 may be equal, or the number of the sliding grooves 190 and the number of the protrusion structures 320 may be unequal, for example, the thickness of the pressing plate 300 is thicker, and a plurality of protrusion structures 320 may be arranged along the thickness direction to correspond to one sliding groove 190. By way of illustration only and not limitation of the scope of protection, two slide grooves 190 are formed in each of the second side plate 131 and the fourth side plate 150, and four slide grooves 190 are engaged with four protrusion structures 320 on the pressing plate 300. It will be appreciated that the location of the sliding grooves 190 and the number of sliding grooves 190 may be selected according to actual needs without departing from the spirit of the present application, and are not specifically limited herein.
For details of the second embodiment, reference may be made to the descriptions of the foregoing embodiments, and details thereof are omitted herein.
Example III
In order to simulate the situation that foam is arranged between adjacent cells in the battery module to buffer expansion of the cells during use, the testing device provided by the application further comprises an elastic component 800 arranged between a pressure component such as the pressing plate 300 and the driving component 400.
The elastic assembly 800 may be deformed along the direction in which the pressing plate 300 reciprocates under the action of the driving assembly 400 or the battery cell 700 to be tested. Specifically, when the driving assembly 400 drives the pressing plate 300 to approach the to-be-tested battery cell 700, the elastic assembly 800 senses that the force applied by the driving assembly 400 is compressed in a direction approaching the to-be-tested battery cell 700, and at this time, the deformation of the elastic assembly 800 can be used as a calculation basis for calculating the pressure applied by the pressing plate 300 to the to-be-tested battery cell 700; when the cell 700 to be tested expands and increases in thickness, the pressing plate 300 moves upward and thereby compresses the elastic member 800 in a direction away from the cell 700 to be tested when a reaction force is generated to the pressing plate 300. In the present application, the elastic member 800 may be provided with one end connected to the driving member 400 and the other end connected to the pressing plate 300.
In another specific embodiment, the elastic member 800 is provided with one end connected to the driving member 400 and the other end abutting the pressing plate 300 when contacting the pressing plate 300. When the pressing plate 300 is not contacted, the elastic member 800 is not contacted and connected with the pressing plate 300. Under such a structure, the pressing plate 300 cannot stay at a position under the action of the elastic component 800, so as to prevent the pressing plate 300 from directly sliding down onto the battery cell 700 to be tested, the protrusion structure 320 of the pressing plate 300 is specially configured to have a certain friction force in the sliding chute 190, and when the external force is smaller than a preset value (including no external force), the protrusion structure 320 can be fixed at a preset position in the sliding chute 190 based on the friction force. When the external force is greater than or equal to a preset value, the protrusion structure 320 slides in the chute 190, that is, the pressing plate 300 slides relative to the case 100.
As a specific embodiment, the driving assembly 400 of the present application includes a telescopic bolt, and the elastic assembly 800 includes an elastic rod connected below the telescopic bolt, and the lower end of the elastic rod is connected to or abutted against a pressure assembly such as the pressing plate 300. The device further comprises a telescopic bolt mounting plate 120 which is arranged at a preset distance above one side of the pressure component, which is far away from the battery cell 700 to be tested, and is provided with a bolt mounting hole 160 for mounting a telescopic bolt. By rotating the extension bolt at the bolt mounting hole 160, the extension bolt and the elastic rod connected below can be moved down and thus the pressing plate 300 is pressed down to the surface of the cell 700 to be tested. Wherein the spring bar may provide a proportion of the spring force like a spring. Wherein the expansion bolt mounting plate 120 can be provided in a separate housing, such as by other brackets. The telescopic bolt mounting plate 120 may also be disposed on the box 100, specifically, the side plate of the test cavity 900 extends upwards along a side far away from the test cavity 900 to form a support structure 132, and a top plate is disposed on an upper end surface of the support structure 132 as the telescopic bolt mounting plate 120, and the top plate is provided with a bolt mounting hole 160. The extension bolt passes through the bolt installation hole 160 to be connected with one end of the elastic rod. At this time, by rotating the extension bolt 400 in the bolt mounting hole 160 of the top plate, the extension bolt 400 and the elastic rod 800 connected therebelow can be moved down and thus the pressing plate 300 can be pressed down to the surface of the cell 700 to be tested.
When the top plate of the box is used as the telescopic bolt mounting plate 120, in order to better observe the downward moving position of the telescopic bolt, in the present application, at least one opening may be provided in the support structure 132 between the top plate and the test cavity 900, so as to observe the position of the telescopic bolt.
As previously described, the end of the spring rod remote from the expansion bolts may be coupled to the pressure plate 300. By way of illustration only and not limitation, the end of the spring rod away from the expansion bolt may be connected to the pressing plate 300 by welding, riveting, screwing, keying, pinning, etc., and may be selected according to actual needs without departing from the concept of the present application, which is not particularly limited herein. In the embodiment of the present application, the number of the telescopic bolts is two, the number of the bolt mounting holes 160 is also two, and the pressure applied to the pressing plate 300 by the two telescopic bolts passing through the corresponding bolt mounting holes 160 is more uniform. Here, the number of the expansion bolts and the number of the bolt mounting holes 160 may be selected according to actual needs, and are not particularly limited herein.
In another specific embodiment, the expansion bolt is connected to one end of the elastic rod through the bolt mounting hole 160, and the end of the elastic rod away from the expansion bolt is abutted to the pressing plate 300. The protrusion 320 of the pressing plate 300 has a certain friction force in the sliding groove 190, and when the external force is less than a preset value (including no external force), the protrusion 320 may be fixed at a preset position in the sliding groove 190 based on the friction force. When the external force is greater than or equal to a preset value, the protrusion structure 320 slides in the chute 190, that is, the pressing plate 300 slides relative to the case 100.
In order to better limit the telescopic bolts and the elastic rods, the pressing plate 300 is provided with a positioning groove 330, the elastic rods are connected or abutted to the positioning groove 330, the elastic rods are compressed by rotating the telescopic bolts, the pressing plate 300 is driven to press downwards by the elastic rods, and then a certain value of pressure is applied to the battery cell 700 to be tested. The elastic rod is also provided with a pressure sensor, and the pressure sensor can test the pressure of the elastic rod to the pressing plate 300, namely the pressure applied to the surface of the battery cell 700 to be tested.
By applying a certain pressure to the surface of the battery cell 700 to be tested through the driving assembly 400 and the elastic assembly 800, on one hand, the state of the battery cell 700 to be tested in the actual assembly process can be more truly simulated; on the other hand, applying a certain pressure to the battery cell 700 to be tested can create conditions more favorable for charging and discharging the battery. The test environment is closer to the state of the battery cell in the actual assembly process, so that the accuracy of the performance test of the battery cell can be improved.
In the third embodiment, the details of the third embodiment are described in the foregoing embodiments, and are not described herein.
Example IV
The lithium ion battery can generate potential safety hazards at too high or too low temperature, the battery can generate thermal runaway phenomenon due to the too high temperature, and the battery internal structure is damaged or the battery performance is reduced due to the too low temperature, so that the battery temperature test is particularly important.
In an embodiment of the present application, the performance testing assembly includes a temperature testing assembly 500, where the temperature testing assembly 500 is used for testing the temperature of the battery cell 700 to be tested. Fig. 6 is a schematic structural diagram of a temperature testing assembly according to an embodiment of the present application, as shown in fig. 6, the temperature testing assembly 500 includes a heat conducting layer 510 disposed on the pressure assembly and contacting with a surface of the to-be-tested battery cell 700 when the pressure assembly is located at the force applying position, and a temperature probe 520 disposed on a surface of the heat conducting layer 510 away from the to-be-tested battery cell 700. When the temperature of the battery cell 700 to be tested is tested, the heat conduction layer 510 can be in surface contact with the battery cell 700 to be tested under the action force of the pressure component, and in the normal charge and discharge process, the temperature of the battery cell 700 to be tested can be transmitted to the heat conduction layer 510, and the temperature probe 520 can obtain the temperature of the battery cell 700 to be tested by testing the temperature of the heat conduction layer 510, so that the change of the temperature probe 520 from point contact to surface contact is realized, the monitoring area of the temperature is increased, and the accuracy of the temperature test is improved. In addition, a certain pressure is applied to the pressure assembly by the driving assembly 400 and the elastic assembly 800, so that the heat conducting layer 510 and the surface of the battery cell 700 to be tested can be ensured to be in close contact, namely, the temperature probe 520 and the surface of the battery cell 700 to be tested are ensured to be in close contact, and further, the error caused by poor contact is reduced.
Further, the heat conductive layer 510 is a metal material with excellent heat conductivity, including aluminum alloy, etc., and may be selected according to actual needs without departing from the inventive concept, and is not particularly limited herein.
In the fourth embodiment, the details of the foregoing embodiments may be referred to, and will not be described herein.
Example five
In the use process of the battery module, as the two sides of the battery cell group are provided with the wiring and/or the gaps of the BMS, the temperature at the center of the battery cell is highest, and the temperature test of the battery cell is based on the highest temperature.
In this embodiment, the heat conducting layer 510 is disposed at the center of the pressing plate 300, and the temperature at the center of the battery cell 700 to be tested can be tested. In addition, the heat conducting layer 510 is arranged at the center of the pressing plate 300, so that the tabs 710 at the two ends of the battery cell 700 to be tested can be prevented from contacting simultaneously, and the occurrence of short circuit can be effectively prevented. As a preferred embodiment, along the direction in which the battery cell protrudes from the tab, the length of the thermally conductive layer 510 in this direction is less than the length of the battery cell.
For the details of the fifth embodiment, reference may be made to the descriptions of the foregoing embodiments, and the details are not repeated here.
Example six
The power assembly 200 is used for connecting the battery cell 700 to be tested with peripheral charging and discharging equipment to realize charging and discharging of the battery cell 700 to be tested. In this embodiment, the power assembly 200 is disposed on the base 110, and the power assembly 200 is connected to the battery cell 700 to be tested and the peripheral charging and discharging device through a power line to realize charging and discharging of the battery cell 700 to be tested.
Referring further to fig. 5, the power assembly 200 includes a support unit 210, a conductive unit 220 disposed on the support unit 210, and a power line mounting port 230. The conductive unit 220 is used for electrically connecting the peripheral charge and discharge device and the battery cell 700 to be tested, the side plate of the box 100 is provided with a mounting hole 170, and the power line passes through the mounting hole 170 and is connected with the power line mounting hole 230 so as to realize the connection between the peripheral charge and discharge device and the conductive unit 220.
In a specific embodiment, the number of the power assemblies 200 is two, and the two power assemblies 200 are respectively disposed on two sides of the base 110 to adapt to the battery cells of which two sides respectively extend out of the positive and negative electrode lugs. The number of the mounting holes 170 is two, and the mounting holes 170 are respectively provided on the first side plate 130 and the third side plate 140. Here, the installation position of the installation hole 170 corresponds to the position of the power line installation hole 230.
Further, the conductive unit 220 is further provided with a tab mounting hole 240, and the positive and negative electrodes of the battery cell 700 to be tested are respectively connected with the tab mounting holes 240 of the power assembly 200 arranged at two sides of the base 110 through the tabs 710. By way of illustration only and not limitation, the tab 710 and the tab mounting hole 240 may be connected by a screw, and may be selected according to practical needs without departing from the inventive concept, without being limited thereto.
In order to facilitate the limitation of the power assembly 200, a mounting groove 180 is provided on the surface of the base 110, and the power assembly 200 is mounted in the mounting groove 180. As a preferred embodiment, the mounting slots 180 have an area greater than the area of the power assembly 200, and the power assembly 200 can be moved in position within the mounting slots 180 to accommodate different sized battery cells, thereby improving the fit of the test device. In the embodiment of the present application, the caulking block (not shown) is used to fill the gap in the mounting groove 180 after the battery cell 700 to be tested and the power assembly 200 are mounted, on one hand, the caulking block (not shown) can fix the power assembly 200, and on the other hand, the caulking block (not shown) can form an integral plane with the surface of the base 110 contacting the battery cell 700 to be tested.
In the sixth embodiment, the details of the foregoing embodiments may be referred to, and will not be described herein.
Example seven
In order to realize the voltage test of the to-be-tested battery cell 700, the performance test assembly further comprises a voltage test assembly, wherein the voltage test assembly is used for testing the voltage of the to-be-tested battery cell, and the voltage test assembly comprises a voltage acquisition line.
In a specific embodiment, the voltage acquisition line tests the voltage value of the cell 700 under test through the power line.
In another embodiment, the voltage acquisition line tests the voltage value of the cell 700 under test through the conductive unit 220.
In order to avoid safety problems when the temperature and/or pressure of the battery cell 700 to be tested exceeds a certain value, the testing device further comprises a temperature and pressure alarm assembly (not shown) and a display 600. The temperature and pressure alarm assembly (not shown) is used for sending an alarm signal when the temperature of the battery cell 700 to be tested exceeds a first threshold value or the pressure of the battery cell 700 to be tested exceeds a second threshold value. The display 600 is used for displaying the performance parameters of the battery cell 700 to be tested, which are tested by the performance testing component, and the display 600 is also used for providing a signal to the peripheral charging and discharging device to disconnect the peripheral charging and discharging device from the battery cell 700 to be tested when the performance parameters of the battery cell 700 to be tested exceed a preset threshold, wherein the performance parameters comprise temperature, pressure, voltage and the like. Here, the first threshold, the second threshold, and the preset threshold may be set according to the actual needs of the user, which is not specifically limited herein.
In the process of testing the temperature and the pressure of the battery cell 700 to be tested, the safety risk is further reduced due to the addition of multiple protections such as temperature protection, pressure protection, voltage protection of charge and discharge equipment and the like.
For details of the seventh embodiment, reference may be made to the descriptions of the foregoing embodiments, and details thereof are omitted herein.
Example eight
In order to reduce the influence of environmental heat dissipation on the temperature of the battery cell, so that the state of the battery cell in the test process is closer to the state in the actual assembly process, the structure of the pressing plate 300 and the base 110 and the side plates in the case 100 is further defined in this embodiment. At least one of the pressing plate 300, the base 110, and the side plates has a hollow structure, and the hollow structure is filled with a heat insulating material.
As a preferred embodiment, the pressing plate 300, the base 110, and the side plates are hollow structures, and the hollow structures are filled with a heat insulating material. In the process of testing the battery cell, the base 110, the side plates and the pressing plate 300 wrap the battery cell between the heat preservation layers to be closer to the actual state of the battery cell in the actual assembly process, so that the influence of heat dissipation on the temperature test is reduced. The airtight space formed by the heat preservation layer is equivalent to placing the battery cell 700 to be tested in a similar adiabatic environment, so that the influence of heat dissipation of the battery cell 700 to be tested is reduced, the influence of external factors on the temperature of the battery cell 700 to be tested is reduced, and the temperature tested by the temperature probe 520 is ensured to be the real temperature of the battery cell 700 to be tested in the charging and discharging processes as much as possible.
For the details of the eighth embodiment, reference may be made to the descriptions of the foregoing embodiments, and the details are not repeated here.
Example nine
In order to increase the safety performance of the testing device, the structure of the base 110 is further defined in this embodiment, and the base 110 is of at least two-layer structure, where the at least two-layer structure includes a supporting layer and a flame retardant layer sequentially disposed along a direction away from the testing cavity 900, and the material of the supporting layer includes an insulating material. By way of illustration only and not by way of limitation of the scope of protection, the insulating material comprises plastic or corundum, etc., and the material of the flame-retardant layer comprises aerogel, etc., which may be selected according to the actual needs without departing from the inventive concept, without being particularly limited herein.
In one specific embodiment, the base 110 is a two-layer structure, which is a support layer and a flame retardant layer sequentially disposed in a direction away from the test cavity 900, and the flame retardant layer may be coated on the support layer.
In another specific embodiment, the base 110 is a three-layer structure including a supporting layer, a flame retardant layer, and a supporting layer sequentially disposed along a direction away from the test cavity 900, and in addition, the base 110 is also a hollow structure in which the flame retardant layer is disposed and a thermal insulation material may be disposed. The insulation effect of the device can be further improved through the arrangement of the three-layer structure.
It should be noted that, the base may also have a structure greater than three layers, such as a six-layer structure, where the six-layer structure is a supporting layer, a flame retardant layer, a supporting layer, and a flame retardant layer, which are sequentially disposed along a direction away from the test cavity 900.
By providing the base 110 with a support layer and a flame retardant layer of insulating material, the risk of electrical shorting can be eliminated. In the testing process, the battery cell 700 to be tested is coated in a sealed insulating voltage-resistant flame-retardant hard box, so that a combustion channel is blocked, and even if the battery cell 700 to be tested is out of control, certain damage to external equipment or personnel cannot be caused.
Further, the specific process of testing the pressure and the temperature of the battery by the testing device is as follows:
the mounting sequence of the caulking blocks (not shown) and the power assembly 200 is adjusted according to the actual length of the battery cell 700 to be tested, the power assembly 200 and the caulking blocks (not shown) are mounted in the mounting groove 180 of the base 110 of the test device, and other components of the power assembly 200 and the caulking blocks (not shown) except the power line mounting port 230 and the tab mounting hole 240 are flush with the bottom surface of the base 110. Then, the tab 710 of the battery cell 700 to be tested is fixed to the tab mounting hole 240 by a screw, and the battery cell 700 to be tested is normally charged and discharged and tested for voltage by the power assembly 200.
After the to-be-tested battery cell 700 is placed, the pressing plate 300 moves to the surface of the to-be-tested battery cell 700 through the sliding groove 190, and then the telescopic bolt is rotated to press the pressing plate 300 to the surface of the to-be-tested battery cell 700. Because the bottom of telescopic bolt is connected with the compression pole, through telescopic bolt downward compression pole, compression pole drives clamp plate 300 and pushes down, and the pressure sensor on compression pole surface can test compression pole to clamp plate 300's pressure, and this pressure is the pressure that awaits measuring cell 700 surface received to with concrete pressure numerical value transmission to display 600.
In the charge and discharge process, the temperature of the surface of the battery cell 700 to be tested is transmitted to the heat conducting layer 510 on the surface of the pressing plate 300, the temperature probe 520 arranged on the heat conducting layer 510 is used for testing the temperature of the heat conducting layer 510 to obtain the temperature of the battery cell 700 to be tested, the temperature is transmitted to the display 600, and a tester is convenient for monitoring and recording the temperature of the battery cell 700 to be tested in the whole charge and discharge process.
In addition, during the charge and discharge process, the cell 700 to be tested is contracted or expanded to drive the pressing plate 300 to move, the actual pressure is recorded by compressing the compression rod, and the pressure is transmitted to the display 600. If the performance parameters (including temperature and pressure) of the battery cell 700 to be tested are greater than the preset threshold, the display 600 will provide a signal to the peripheral charging and discharging device, so as to disconnect the charging and discharging channel, and further secure the safety.
For details of the ninth embodiment, reference may be made to the descriptions of the foregoing embodiments, which are not repeated here.
The above describes in detail the performance test device for simulating the battery cell in the battery module, and specific examples are applied to illustrate the principle and the implementation of the application, and the above description of the examples is only used for helping to understand the method and the core idea of the application; also, it is within the scope of the present application to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the application.
Claims (10)
1. A performance test device for simulating an electric core in a battery module is characterized by comprising: the device comprises a box body, a power assembly, a driving assembly, a pressure assembly and a performance testing assembly;
the pressure component is connected to the inner wall of the box body and forms a closed test cavity with the box body, the test cavity is used for placing a battery cell to be tested, and the pressure component can reciprocate on the inner wall of the box body in a direction away from or towards the battery cell to be tested under the drive of the driving component;
When the pressure component moves towards the battery cell to be tested and is positioned at a force application position for applying pressure to the battery cell to be tested, the box body, the battery cell to be tested and the pressure component form an analog battery module;
the power component is connected with the battery cell to be tested and peripheral charging and discharging equipment so as to realize charging and discharging of the battery cell to be tested;
the performance testing component is used for testing the performance parameters of the battery cell to be tested, and the performance parameters of the battery cell to be tested comprise at least one of temperature, pressure and voltage.
2. The device for testing the performance of the battery cells in the simulated battery module according to claim 1, wherein the pressure assembly comprises a pressure plate, the box body comprises a base and a side plate, and the pressure plate, the base and the side plate are enclosed to form the testing cavity; at least one of the pressing plate, the base and the side plate is of a hollow structure, and the hollow structure is filled with heat insulation materials.
3. The device for testing the performance of the battery cells in the simulated battery module according to claim 2, wherein the base is of at least two-layer structure, the at least two-layer structure comprises a supporting layer and a flame-retardant layer which are sequentially arranged along a direction away from the testing cavity, and the material of the supporting layer comprises an insulating material.
4. The device for testing the performance of the battery cells in the simulated battery module according to claim 2, wherein the base is of at least three-layer structure, the at least three-layer structure comprises a supporting layer, a flame-retardant layer and a supporting layer which are sequentially arranged along a direction away from the testing cavity, the material of the supporting layer comprises an insulating material, the base is of a hollow structure, and the flame-retardant layer is arranged in the hollow structure.
5. The device for testing the performance of the battery cells in the simulated battery module according to claim 2, wherein the surface of the base is provided with a mounting groove for mounting the power module, the mounting groove is provided with a groove for fixing the power module
The area of the mounting groove is larger than the bottom area of the power assembly, the testing device further comprises a joint filling block, the joint filling block is arranged in the mounting groove, and the joint filling block is abutted with the power assembly to fix the power assembly in the mounting groove.
6. The device for testing the performance of the battery cell in the simulated battery module according to claim 2, wherein the pressing plate comprises a pressing plate body and a protruding structure connected with the pressing plate body, sliding grooves matched with the protruding structure are formed in the side plates which are arranged oppositely, and the protruding structure can reciprocate in the sliding grooves in a direction away from or towards the battery cell to be tested.
7. The device for testing the performance of the battery cells in the simulated battery module according to claim 6, further comprising an elastic component arranged between the driving component and the pressing plate, wherein the elastic component can deform along the reciprocating movement direction of the pressing plate under the action of the driving component or the battery cells to be tested;
preferably, one end of the elastic component is connected with the driving component, and the other end of the elastic component is connected with the pressing plate:
or alternatively, the first and second heat exchangers may be,
preferably, one end of the elastic component is connected with the driving component, the other end of the elastic component is abutted to the pressing plate when contacting with the pressing plate, the protruding structure and the sliding groove have preset friction force, the friction force is set to be kept motionless in the sliding groove when the pressing plate receives an external force smaller than a preset pressure value, and the protruding structure slides in the sliding groove when the pressing plate receives an external force not smaller than the preset pressure value.
8. The device for testing the performance of the battery cell in the simulated battery module according to claim 7, wherein the driving assembly comprises a telescopic bolt, the elastic assembly comprises an elastic rod, a mounting groove is formed in the pressing plate, the box body further comprises a top plate, the top plate is arranged on one side, far away from the testing cavity, of the pressing plate, a bolt mounting hole is formed in the top plate, the telescopic bolt penetrates through the bolt mounting hole to be connected with the elastic rod, and one end, far away from the telescopic bolt, of the elastic rod is connected with or abutted against the positioning groove.
9. The device for testing the performance of the battery cells in the simulated battery module according to claim 1, wherein the performance testing assembly comprises a temperature testing assembly, the temperature testing assembly comprises a heat conducting layer which is arranged on the pressure assembly and is in surface contact with the battery cells to be tested when the pressure assembly is positioned at the force application position, and a temperature probe which is arranged on one surface of the heat conducting layer far away from the battery cells to be tested, and the temperature probe is used for obtaining the temperature of the battery cells to be tested by testing the temperature of the heat conducting layer.
10. The device for testing the performance of the battery cell in the simulated battery module according to claim 2, wherein the power component is arranged on the base, the power component is connected with the battery cell to be tested and the peripheral charging and discharging equipment through a power line so as to realize the charging and discharging of the battery cell to be tested, the power component comprises a supporting unit, a conductive unit arranged on the supporting unit and a power line mounting port, the conductive unit is used for electrically connecting the peripheral charging and discharging equipment and the battery cell to be tested, a mounting hole is formed in the side plate, and the power line penetrates through the mounting hole and is connected with the power line mounting port so as to realize the connection of the peripheral charging and discharging equipment and the conductive unit.
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| CN202310528244.6A CN116736158A (en) | 2023-05-11 | 2023-05-11 | Performance test device for simulating battery cells in battery module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117491794A (en) * | 2024-01-03 | 2024-02-02 | 安徽中科星驰自动驾驶技术有限公司 | Test system for intelligent network-connected automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117491794A (en) * | 2024-01-03 | 2024-02-02 | 安徽中科星驰自动驾驶技术有限公司 | Test system for intelligent network-connected automobile |
| CN117491794B (en) * | 2024-01-03 | 2024-04-05 | 安徽中科星驰自动驾驶技术有限公司 | Test system for intelligent network-connected automobile |
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